Using Win32 functions in Visual FoxPro Image Gallery
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Scanning a hierarchy of child windows down from the Windows Desktop

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More code examples    Listed functions    Add comment     W32 Constants      Translate this page Printer friendly version of this code sample
DO decl

LOCAL hParent, hWindow, cTitle, cRect
hParent = GetDesktopWindow()
hWindow = 0

CREATE CURSOR cs (winhandle I,;
    x0 I, y0 I, x1 I, y1 I, wintitle C(200))

    STORE REPLICATE(CHR(0),255) TO cClass, cTitle
    hWindow = FindWindowEx(hParent, hWindow,;
        Null, Null)

    IF hWindow = 0
        ? "Exit on error:", GetLastError()
        cTitle = GetWinText(hWindow)
        cRect = GetWinRect(hWindow)
        INSERT INTO cs VALUES (hWindow,;
            buf2dword(SUBSTR(cRect, 1,4)),;
            buf2dword(SUBSTR(cRect, 5,4)),;
            buf2dword(SUBSTR(cRect, 9,4)),;
            buf2dword(SUBSTR(cRect, 13,4)),;

* end of main

FUNCTION GetWinText(hWindow)
    LOCAL cBuffer
    cBuffer = REPLICATE(CHR(0), 255)
    = GetWindowText(hWindow, @cBuffer, LEN(cBuffer))
RETURN STRTRAN(cBuffer, CHR(0), "")

FUNCTION GetWinRect(hWindow)
    LOCAL cBuffer
    cBuffer = REPLICATE(CHR(0), 16)
    = GetWindowRect(hWindow, @cBuffer)
RETURN cBuffer

    DECLARE INTEGER GetLastError IN kernel32
    DECLARE INTEGER GetDesktopWindow IN user32

    DECLARE INTEGER FindWindowEx IN user32;
        INTEGER hwndParent, INTEGER hwndChildAfter,;
        STRING @lpszClass, STRING @lpszWindow

    DECLARE INTEGER GetWindowText IN user32;
        INTEGER hWnd, STRING @lpString, INTEGER nMaxCount

    DECLARE INTEGER GetWindowRect IN user32;
        INTEGER hWnd, STRING lpRect

FUNCTION buf2dword(lcBuffer)
RETURN Asc(SUBSTR(lcBuffer, 1,1)) + ;
    BitLShift(Asc(SUBSTR(lcBuffer, 2,1)),  8) +;
    BitLShift(Asc(SUBSTR(lcBuffer, 3,1)), 16) +;
    BitLShift(Asc(SUBSTR(lcBuffer, 4,1)), 24)

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1681 bytes  
Created: 2001-07-16 12:00:00  
Modified: 2004-12-24 12:04:29  
Visits in 7 days: 64  
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